The wave number of the first line in the balmer series of `Be^(3+)` ?

Explanation

To find the wave number of the first line in the Balmer series of \( \text{Be}^{3+} \), we can follow these steps:

### Step 1: Understand the Balmer Series
The Balmer series involves electron transitions in hydrogen-like atoms where the electron falls to the second energy level (\( n_l = 2 \)) from higher energy levels (\( n_h = 3, 4, \ldots \)). The first line in the Balmer series corresponds to the transition from \( n_h = 3 \) to \( n_l = 2 \).

### Step 2: Use the Formula for Wave Number
The wave number (\( \bar{\nu} \)) can be calculated using the formula:
\[
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